Yamaichi Electronics Co., Ltd. — AI supply-chain exposure

Yamaichi Electronics makes IC test and burn-in sockets and connectors, the precision interfaces that hold a device while it is stress-tested at temperature to weed out early failures. Its niche is high-pin-count sockets for advanced packages, exactly the dense, multi-die assemblies that AI accelerators and stacked memory now demand. That specialisation is the hook: as packaging grows more intricate, a socket that has to make reliable contact with hundreds of pins becomes harder to build, and the makers who can do it sit at a narrow but real chokepoint in the back-end test flow.